[INFO] crate actix-async-await 0.3.0 is already in cache
[INFO] extracting crate actix-async-await 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/actix-async-await/0.3.0
[INFO] extracting crate actix-async-await 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/actix-async-await/0.3.0
[INFO] validating manifest of actix-async-await-0.3.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of actix-async-await-0.3.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing actix-async-await-0.3.0
[INFO] finished frobbing actix-async-await-0.3.0
[INFO] frobbed toml for actix-async-await-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/actix-async-await/0.3.0/Cargo.toml
[INFO] started frobbing actix-async-await-0.3.0
[INFO] finished frobbing actix-async-await-0.3.0
[INFO] frobbed toml for actix-async-await-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/actix-async-await/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing actix-async-await-0.3.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/actix-async-await/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 45960c2f43cdf267982928ced411b4b47ba7f09366f6cd692a7ab9391ec6dd96
[INFO] running `"docker" "start" "-a" "45960c2f43cdf267982928ced411b4b47ba7f09366f6cd692a7ab9391ec6dd96"`
[INFO] [stderr]    Compiling futures-core-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling actix v0.7.9
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.18
[INFO] [stderr]    Compiling actix-async-await v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(async_await, await_macro, futures_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `R` cannot be sent between threads safely
[INFO] [stderr]   --> src/handler.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |         Arbiter::spawn_async(fut.boxed())
[INFO] [stderr]    |                                  ^^^^^ `R` cannot be sent between threads safely
[INFO] [stderr]    |
[INFO] [stderr]    = help: within `impl core::future::future::Future`, the trait `std::marker::Send` is not implemented for `R`
[INFO] [stderr]    = help: consider adding a `where R: std::marker::Send` bound
[INFO] [stderr]    = note: required because it appears within the type `std::option::Option<R>`
[INFO] [stderr]    = note: required because it appears within the type `[static generator@src/handler.rs:35:30: 40:10 self:handler::ResponseStdFuture<T>, tx:std::option::Option<R> _]`
[INFO] [stderr]    = note: required because it appears within the type `std::future::GenFuture<[static generator@src/handler.rs:35:30: 40:10 self:handler::ResponseStdFuture<T>, tx:std::option::Option<R> _]>`
[INFO] [stderr]    = note: required because it appears within the type `impl core::future::future::Future`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: `*mut (dyn core::future::future::Future<Output = T> + 'static)` cannot be sent between threads safely
[INFO] [stderr]   --> src/handler.rs:41:34
[INFO] [stderr]    |
[INFO] [stderr] 41 |         Arbiter::spawn_async(fut.boxed())
[INFO] [stderr]    |                                  ^^^^^ `*mut (dyn core::future::future::Future<Output = T> + 'static)` cannot be sent between threads safely
[INFO] [stderr]    |
[INFO] [stderr]    = help: within `impl core::future::future::Future`, the trait `std::marker::Send` is not implemented for `*mut (dyn core::future::future::Future<Output = T> + 'static)`
[INFO] [stderr]    = note: required because it appears within the type `futures_core::future::future_obj::LocalFutureObj<'static, T>`
[INFO] [stderr]    = note: required because it appears within the type `handler::ResponseStdFuture<T>`
[INFO] [stderr]    = note: required because it appears within the type `[static generator@src/handler.rs:35:30: 40:10 self:handler::ResponseStdFuture<T>, tx:std::option::Option<R> _]`
[INFO] [stderr]    = note: required because it appears within the type `std::future::GenFuture<[static generator@src/handler.rs:35:30: 40:10 self:handler::ResponseStdFuture<T>, tx:std::option::Option<R> _]>`
[INFO] [stderr]    = note: required because it appears within the type `impl core::future::future::Future`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0277, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `actix-async-await`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "45960c2f43cdf267982928ced411b4b47ba7f09366f6cd692a7ab9391ec6dd96"`
[INFO] running `"docker" "rm" "-f" "45960c2f43cdf267982928ced411b4b47ba7f09366f6cd692a7ab9391ec6dd96"`
[INFO] [stdout] 45960c2f43cdf267982928ced411b4b47ba7f09366f6cd692a7ab9391ec6dd96